40.9 Chapter 14. Linear equations with constant coefficients. Supplemetary problems. Page 92

40.9.1 problem 11
40.9.2 problem 12
40.9.3 problem 13
40.9.4 problem 14
40.9.5 problem 15
40.9.6 problem 16
40.9.7 problem 17
40.9.8 problem 18
40.9.9 problem 19
40.9.10 problem 20
40.9.11 problem 21
40.9.12 problem 22